#include <stdio.h>

	int main()
	{
		int a[3] = {0},i = 0,j = 0;
		
		for(i = 0;i < 3;i++)
		{
			scanf("%d",a + i);
		}
		
		for(i = 0;i < 2;i++)
		{
			for(j = 0;j < 2 - i;j++)
			{
				if(a[j] > a[j + 1])
				{
				int	m = a[j];
					a[j] = a[j + 1];
					a[j + 1] = m;
				}
			}
		}
		
		if(a[2] > a[0] +a[1])
		printf("Not triangle\n");
		else if(a[2] * a[2] == a[0] *a[0] +a[1] * a[1]) 
		printf("Right triangle\n");
		else if(a[2] * a[2] < a[0] *a[0] +a[1] * a[1])
		printf("Acute triangle\n");
		else if(a[2] * a[2] > a[0] *a[0] +a[1] * a[1])
		printf("Obtuse triangle\n");
		
		if(a[0] == a[1]||a[0] == a[2]||a[1] == a[2])
		printf("Isosceles triangle\n");
		if(a[0] == a[1]&&a[0] == a[2])
		printf("Equilateral triangle\n");
		
		return 0;
	}
